Sluice-box.



No. 644,994. Patented Mar. 6, |900. J. MILAN.

SLUIGE BOX.

(Application led July 20, 1899.)

@No model.)

MZMM' me cams Finns co., PHoYo-Lxmo, wnsnmcvon. 0.o.

'rnTns PATENT SLUl'C-BOX.

SPECIFICATION forming part of Letters Patent N 0. 644,994, dated March6, 1900.

ppiiation filed duly 20| 1899. Serial No. 724,530. (No model.)

Y have invented a certain new and useful Sluice- Box, of which thefollowin g is a speciiication, reference being had therein-to the accompanying drawings.

This invention relates to sluice-boxes, and is especially adapted forconcentrating magnetic black sand.

It is well known that certain magnetic black sand contains values ofgold, lead, copper, platinum, che.; and it is the object, as indicated,of this invention to provide a convenient mechanism for concentratingsuch The invention consists in the combination of a main sluice-boxprovided with riiiies, a secondary or auxiliary sluice or spout alsoprovided with rifiles, pipes or passages leading from the base of therifles in the main sluicebox to the auxiliary conduit, and means forintermittently cutting in and cutting out the auxiliary conduit.

The invention also consists in certain details of constructionhereinafter described and claimed. v

In the drawings, Figure l is a perspective of my improved apparatus.Fig. 2 is a section on the line 2 2 of Fig. l looking in the directionindicated by the arrow in Fig. l. Fig. 3 is an enlarged section of thespout or conduit constituting the auxiliary sluice.

l is the main sluice, provided with riffles` 2 of ordinary character.Leading from above the rifiies or shoulders forming the rilies areseries of pipes or passages 3 3, which discharge into the auxiliarysluice or spout 4. The spout .tis also provided with riiiies 5 5 andwith a cap 6. The pipes or passages leading from the main sluice l tothe auxiliary sluice or spout 4 are preferably made in two parts, one ofthe parts being connected with the sluice 1 and the other beingconnected with the auxiliary spout 4. The pipes are formed so as totelescope with each other, so that the auxiliary spout or sluice may beattached to and detached from the main sluice.

'7 is a tank or receptacle for receiving that part of Vthe concentrateswhich passes beyond the ritn lies 5 in the auxiliary sluice.

In order that the auxiliary spout or sluice may be cut into and out ofconnection with themain sluice, I provide a series of gates or valves S8, arranged to swing laterally and upwardly from the openings in theside of the main sluice leading to pipes 3, and in order to operate allof these gates simultaneouslyI connect their upper ends with a bar E)and the barwwith an operating-lever 10.

In operation the black sand or ore to be treated is fed to the mainsluice in the usual way, the gates being closed. When the rif; fles havebeen filled or substantially filled with concentrates, the feeding ofthe ore or sand is suspended, the gates are opened, and clean water isfed into the sluice, which carries the concentrates laterally throughthe passages 3 to the auxiliary spout 4, Where the free gold iscollected behind the iron rit'tles in the auxiliary spout. The blacksand containing gold in combination with other metals and the fine goldpasses to the tank or receptacle 7, from which it is taken to thesinelter for further treatment. When the ore has all been carried fromthe main sluice, the water is cut off, the auxiliary sluice is removedfrom its connection with the main sluice, the cap removed, and the freegold caught on riiiies 5 is discharged from the spout by turning thesame to avertical position.

Having described my invention, what I claim as new, and desire to secureby Letters Patent, is`

l. An ore-concentrator involving the com; bination of a main sluicehaving riiiies and having pipes or passages projecting laterally fromone side of the sluice at the head ofthe rifiies, an auxiliary sluice`or spout having iron riftles and pipes or passages adapted to telescopewith the pipes projecting from the main sluice, and laterally andupwardly swinging gates or valves for opening and closing the passages,substantially as de scribed.

2. In concentrating apparatus, the oombiand a cap for closing one endofthe auxilnation of a main sluioe havin g rifiles and haviary spout,substantially as described. 1o ing pipes or passages leading from oneside In testimony whereof I affix my signature at the head of theriffles, an auxiliary sluiee in presence of two Witnesses.

5 or spout having pipe connections adapted to JOHN MILAN.

telescope with the pipe connect-ions of the Witnesses: main sluioe andhaving iron riiiles, means for HARRY SIMPSON, cutting in and cutting outthe auxiliary spout, R. F. BEALE.

